Zanmataisei Demonbane is the main title of the Demonbane visual novel/anime franchise, centered on a supernatural mecha-fantasy setting involving the ancient grimoire Necronomicon and the giant robot Demonbane. The story follows a battle between occult forces and secret organizations in a world of magic, forbidden technology, and cosmic threats. It is best known as the core/master title of the series rather than a variant subtitle.